Brown Scale Insects on Orchids: Identification and Treatment

Recognizing the Pest

Brown crunchy nodules on stems that come off easily are brown scale insects (adult stage). Sappy leaves indicate feeding. Crawlers (mobile juveniles) spread rapidly. Immediate action is essential.

Multi-Stage Treatment Plan

1. Manual removal: Alcohol-soaked cotton swabs to remove visible adults and crawlers.
2. Hose down: Take plant outside, spray thoroughly with water.
3. Repot: Discard old mix and pot. Rinse roots, remove mushy ones.
4. Systemic insecticide drench: Submerge plant in solution (e.g., Bonide "Eight") per label. Wear chemical gloves.
5. Repot in fresh mix: Use clean pot and orchid mix.
6. Monitor: Watch for recurrence; retreat if needed.

Prevention

Isolate new plants. Inspect regularly. Scale hides in crevices and potting mix. Systemic treatment provides 6-week protection.